diff --git a/core/src/com/unciv/logic/automation/ConstructionAutomation.kt b/core/src/com/unciv/logic/automation/ConstructionAutomation.kt
index b24812b957..88fcfa9135 100644
--- a/core/src/com/unciv/logic/automation/ConstructionAutomation.kt
+++ b/core/src/com/unciv/logic/automation/ConstructionAutomation.kt
@@ -21,9 +21,10 @@ class ConstructionAutomation(val cityConstructions: CityConstructions){
     val cityInfo = cityConstructions.cityInfo
     val civInfo = cityInfo.civInfo
 
-    val buildableNotWonders = cityConstructions.getBuildableBuildings()
+    val buildableBuildings = cityConstructions.getBuildableBuildings().toList()
+    val buildableNotWonders = buildableBuildings
             .filterNot { it.isAnyWonder() }
-    private val buildableWonders = cityConstructions.getBuildableBuildings()
+    private val buildableWonders = buildableBuildings
             .filter { it.isAnyWonder() }
 
     val civUnits = civInfo.getCivUnits()